Metropolis is originally created by Matthias Vogelgesang and is available from https://github.com/matze/mtheme as well as CTAN.
More information about the theme, including the design principles, can be found at http://bloerg.net/2014/09/20/a-modern-beamer-theme.html.
This version demonstrates the use of a progress bar under the frame titles. See the manual for other customisation options.
This template uses metropolis v1.2.